1999 AX21

1999AX21, 17876, 1971 DR1, 1971DR1, 1978 EA8, 1978EA8, J71D01R, J78E08A, J99A21X

All data for this body: [vot]

MPC data
Name (number) 1999 AX21 (17876)
a 2.31335
e 0.07053
i / sin(i) 4.4780 / 0.07808
q 2.15020
Q 2.47650
ω 325.3679
Node 278.4142
m 68.7668
n 0.2801
Epoch 2460800.5
nobs 2968
nopp 22
Years observed 1971-2025
rms 0.70
Best values
[raw, vot]

Value Standard error
Parent
 
ap 2.314
ep 0.085
sin(ip) 0.089
G 0.150
H 14.640
Mass
D 8.18 0.028
pV 0.048 0.0043
Value
Rotational Period
Period quality None
Spectral Class D
Spectral Class Score 2.783
Proper elements data
[raw, vot]

ap ep sin(ip) Author Reference Method
2.3136 0.0853 0.0891 Novakovic_Radovic_Todovic 2003A&A...403.1165K Numeric-Nov-2024
Diameter data
[raw, vot]

Value Uncertainty up Uncertainty down Author Reference Method
6.50 1.960 1.960 Masiero 2021PSJ.....2..162M NEATM
7.32 2.380 2.380 Nugent 2016AJ....152...63N NEATM
7.33 1.980 1.980 Masiero 2020PSJ.....1....5M NEATM
7.85 2.950 2.950 Masiero 2020PSJ.....1....5M NEATM
7.91 0.033 0.033 Masiero 2011ApJ...741...68M NEATM
8.01 2.280 2.280 Masiero 2020PSJ.....1....5M NEATM
8.81 0.051 0.051 Masiero 2011ApJ...741...68M NEATM
8.83 2.000 2.000 Masiero 2020PSJ.....1....5M NEATM
Albedo data
[raw, vot]

Value Uncertainty up Uncertainty down Author Reference Method
0.040 0.0400 0.0400 Nugent 2016AJ....152...63N NEATM
0.044 0.0066 0.0066 Masiero 2011ApJ...741...68M NEATM
0.044 0.0370 0.0370 Masiero 2020PSJ.....1....5M NEATM
0.045 0.0360 0.0360 Masiero 2020PSJ.....1....5M NEATM
0.045 0.0660 0.0660 Masiero 2020PSJ.....1....5M NEATM
0.051 0.0310 0.0310 Masiero 2020PSJ.....1....5M NEATM
0.052 0.0060 0.0060 Masiero 2011ApJ...741...68M NEATM
0.063 0.0330 0.0680 Masiero 2021PSJ.....2..162M NEATM
G data
[raw, vot]

Value Uncertainty up Uncertainty down Author Reference Method
0.15 MPC-2023-12-94 MPC-2023-12-94 Phot
H data
[raw, vot]

Value Uncertainty up Uncertainty down Author Reference Method
14.64 MPC-2023-12-04 MPC-2023-12-04 Phot
Spectral Class Data
[raw, vot]

Class 1 Class 2 Probability of Class 1 Probability of Class 2 Taxonomy Wavelength Author Reference Method
D 0.38 Bus VIS Carvano 2010A&A...510A..43C PHOT
D D 0.3372 0.3372 Bus-Demeo VIS Sergeyev 2021A&A...652A..59S PHOT
X 0.327 Bus-Demeo VIS Sergeyev 2022A&A...658A.109S PHOT